page_title: Mount Forgotten
section_title: Geology
hierarchical_section_title: Mount Forgotten / Geology
caption_attribution_description: English: Mt. Forgotten at Perry Creek Research Natural Area
context_page_description: Mount Forgotten is a 6,005-foot mountain summit near the western edge of the North Cascades, in Snohomish County of Washington state. It is located five miles north of Barlow Pass along the Mountain Loop Highway near the Monte Cristo area and is situated on land administered by the Mount Baker-Snoqualmie National Forest. The nearest higher peak is Mount Pugh, 4.22 mi to the northeast. Precipitation runoff from the mountain drains into tributaries of the Sauk River.
context_section_description: The North Cascades features some of the most rugged topography in the Cascade Range with craggy peaks, ridges, and deep glacial valleys. Geological events occurring many years ago created the diverse topography and drastic elevation changes over the Cascade Range leading to various climate differences. These climate differences lead to vegetation variety defining the ecoregions in this area.
  The history of the formation of the Cascade Mountains dates back millions of years ago to the late Eocene Epoch. With the North American Plate overriding the Pacific Plate, episodes of volcanic igneous activity persisted. Glacier Peak, a stratovolcano that is 15.35 mi (24.70 km) east of Mount Forgotten, began forming in the mid-Pleistocene and Forgotten is composed of volcanic breccia. In addition, small fragments of the oceanic and continental lithosphere called terranes created the North Cascades about 50 million years ago.
  During the Pleistocene period dating back over two million years ago, glaciation advancing and retreating repeatedly scoured the landscape leaving deposits of rock debris. The U-shaped cross section of the river valleys are a result of recent glaciation. Uplift and faulting in combination with glaciation have been the dominant processes which have created the tall peaks and deep valleys of the North Cascades area.
caption: Mount Forgotten
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